Step In If U No About Nos And Spark Plug Gaps
05-29-2008, 10:28 PM
#2
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Spark Plug Info
**Note: Heat ranges are determined by NGK standards. Not all plug manufacturers follow the same guidelines.
***Note: List is intended for reference only. Please consult with head mfg. and ignition mfg. for proper gap.
****Note: NGK IX and Denso plugs are Iridium.
LT1
Thread – 14mm
Reach - .708”
Socket – 5/8 hex
Seat - Taper
Stock Heat Range: 5
Gap: .050
Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Champion RS14YC6 (stock number 13); Denso IT-16 (stock number 5325)
Nitrous (one step colder)
Heat range: 6
Gap: .035 - .038
Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Autolite 103; Denso IT-20 (stock number 5326)
Nitrous (two steps colder)
Heat Range: 7
Gap: Consult
Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Autolite AR94; Denso IT22 (stock number 5327)
**Note: Heat ranges are determined by NGK standards. Not all plug manufacturers follow the same guidelines.
***Note: List is intended for reference only. Please consult with head mfg. and ignition mfg. for proper gap.
****Note: NGK IX and Denso plugs are Iridium.
LT1
Thread – 14mm
Reach - .708”
Socket – 5/8 hex
Seat - Taper
Stock Heat Range: 5
Gap: .050
Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Champion RS14YC6 (stock number 13); Denso IT-16 (stock number 5325)
Nitrous (one step colder)
Heat range: 6
Gap: .035 - .038
Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Autolite 103; Denso IT-20 (stock number 5326)
Nitrous (two steps colder)
Heat Range: 7
Gap: Consult
Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Autolite AR94; Denso IT22 (stock number 5327)
05-29-2008, 11:00 PM
#4
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Join Date: Feb 2008
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The last thread 2 recommended TR6 I would not go colder! The ones you have are colder, try them if you can't return them, but they will quickly foul out. There is no way to make up for the wrong temp range with the plug gap.
On a 150 shot I would use Autolite 106 with ~.035" and an MSD coil. I use TR55 or Autolite 106 with up to 12 psi boost and no problems.
Good luck
On a 150 shot I would use Autolite 106 with ~.035" and an MSD coil. I use TR55 or Autolite 106 with up to 12 psi boost and no problems.
Good luck
